Changes

* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.

* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.

* [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|Cervix]] is relaxed

* [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|Cervix]] is relaxed

* Ovulation occurs during this phase in all domestic species except the cow.

* [[The_Ovary_-_Ovulation_-_Anatomy_%26_Physiology|Ovulation]] occurs during this phase in all domestic species except the cow.

** The cow ovulates ~12 hours after the end of oestrus.

** The cow [[The_Ovary_-_Ovulation_-_Anatomy_%26_Physiology|ovulates]] ~12 hours after the end of oestrus.

* Ovulation is spontaneous in all domestic species except the cat, rabbit and camelids.  In these species it is induced by the act of copulation.

* Ovulation is spontaneous in all domestic species except the cat, rabbit and camelids.  In these species it is induced by the act of copulation.

* During pro-oestrous and oestrus there is follicular growth with no functional corpora lutea present on the ovary (aka follicular phase).

* During pro-oestrous and oestrus there is follicular growth with no functional corpora lutea present on the ovary (aka follicular phase).